North Beggar Hung 7 Gung and Gwok Jing were both injured by West Poison Au Yeung Fung's Ha Mo Gung during LOCH. Whereas Hung 7 Gung needed two years to recover from his injury, however, Gwok Jing fully recovered from his injury within ten days.
Au Yeung Fung most likely used a more powerful attack against Hung 7 Gung than he later did against Gwok Jing. After all, Hung 7 Gung was far more powerful fighter than Gwok Jing during LOCH, and Au Yeung Fung could not afford to take the old beggar lightly. Moreover, Hung 7 Gung was Au Yeung Fung's mortal enemy; Au Yeung Fung had no reason to hit Hung with anything less than his most powerful strike. On the other hand, Au Yeung Fung needed Gwok Jing alive to recite the text of the 9 Yum Jen Ging for him, so Au Yeung could not afford to use lethal force on Gwok. Even if Au Yeung Fung hit Gwok Jing with a less powerful Ha Mo Gung strike than he used against Hung 7 Gung, however, Gwok Jing's injury was compounded by Yeung Hong's throwing a dagger into his chest.
Gwok Jing's relatively quick recovery is attributable to Wong Yung's use of the 9 Yum Jen Ging's Deun Gwut Yik Gun Peen, which the young couple already had access to at the time of Hung 7 Gung's injury. If it worked for Gwok Jing in just ten days, why couldn't Gwok Jing and Wong Yung just use this same technique to heal Hung 7 Gung? As it was, Hung 7 Gung's injury did not make much progress towards recovery until after Gwok Jing and Wong Yung obtained the translated Sanskrit portion of the 9 Yum Jen Ging from South Emperor 1 Deng the Monk, and even then, Hung 7 Gung needed another year and a half to fully recover.
Very strange how the Ha Mo Gung injuries of Hung 7 Gung and Gwok Jing were treated so differently.